Electron-phonon coupling in {kappa}-(BEDT-TTF){sub 2}Cu(NCS){sub 2} organic superconductor studied by Raman scattering spectroscopy.
Low frequency Raman data for {kappa}-(ET){sub 2}Cu(NCS){sub 2}(T{sub c} = 10.4 K) are reported. Measurements have been performed in a wide range of temperatures (1.5-100 K) and frequency hardening related to the superconducting transition has been observed for all the low-lying coupled phonons. The measured relative frequency shifts are lower than those previously reported for {kappa}-(ET){sub 2}Cu[N(CN){sub 2}]Br (T{sub c} = 11.67 K), but the behavior of the two systems is similar and indicates a significant strength of the intermolecular electron-photon coupling. The effects of isotopic substitutions ({sup 13}C{sub 4} {sup 34}S{sub 8} and {sup 2}H{sub 8}) in ET molecules on the low frequency Raman active phonons of {kappa}-(ET{sub 2}Cu(NCS){sub 2}) are also reported. They give the first direct experimental confirmation to the suggested lattice softening induced by deuteration.
- Research Organization:
- Argonne National Lab., IL (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10909
- Report Number(s):
- ANL/CHM/CP-96970; TRN: AH200127%%483
- Resource Relation:
- Conference: International Conference on Science and Technology of Synthetic Metals, Montpellier (FR), 07/12/1998--07/18/1998; Other Information: PBD: 31 Jul 1998
- Country of Publication:
- United States
- Language:
- English
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